2017.01.06. 17:33 keltezéssel, Steven Liu írta:
2017-01-07 0:22 GMT+08:00 Bodecs Bela <bode...@vivanet.hu>:
2017.01.06. 16:50 keltezéssel, Steven Liu írta:
2017-01-06 22:07 GMT+08:00 Bodecs Bela <bode...@vivanet.hu>:
Dear All,
in avformat/hlsenc the start_number option starts the playlist sequence
number
(#EXT-X-MEDIA-SEQUENCE) from the specified number. Unless hls_flags
single_file is set, it also specifies starting sequence numbers of
segment and subtitle filenames. Sometimes it is usefull to have unique
starting numbers at each run, but currently it is only achiveable by
setting this parameter manually.
This patch enables to set start_number parameter automatically for
practically unique numbers. If start_number is set to -1, then
the start number will be the seconds since epoch (1970-01-01 00:00:00).
If set to -2, then the start number will be based on the current
date/time value as YYYYmmddHHMMSS. e.g. 20161231235659.
thank you,
Bela Bodecs
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Two question:
1. char b[21]; Why this is 21 ?
you are right, 15 is enough.
2. + {"start_number", "set first number in the sequence",
OFFSET(start_sequence),AV_OPT_TYPE_INT64, {.i64 = 0}, -2,
INT64_MAX,
E},
Why is this -2 and the help message maybe need more infomation, for
example
-2 mean -1 mean 0 mean, and default value.
yes, I have altered now but I have written verbosly into the doc
(muxers.texi), here:
+If set to -1, then the start number will be the seconds since epoch
(1970-01-01 00:00:00).
+If set to -2, then the start number will be based on the current
date/time as YYYYmmddHHMMSS. e.g. 20161231235759.
+Default value is 0.
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I have enclosed a fixed version. A have changed some code, where greater
than 32 bit long sequence numbers were not handled correctly.
(av_get_frame_filename2)
thank you.
Bela Bodecs
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+ {"start_number", "set first number in the sequence, 0 is default, -1:
second since epoch, -2: current datetime as YYYYMMDDhhmmss, actual value
otherwise", OFFSET(start_sequence),AV_OPT_TYPE_INT64, {.i64 = 0}, -2,
INT64_MAX, E},
I have check this option, i think add flag to control the start_number
maybe better,
for example:
hls_flags
hls_playlist_type
maybe add a start_number_flags is better, What about you think?
Using hls_flags is not enough to specify different values for them.
I thought that there should be 3 options beside this start_number option.
hls_start_number_playlist, hls_start_number_segment and hls_start_number_vtt
Using start_number and any of the new 3 ones would be mutualy exlusive.
This way anybody could use the old option (start_number) and it won't
break the current behaviour.
But those who want to have finer control, they may use the new options.
of course -start_number x has the same effect as using
-hls_start_number_playlist x -hls_start_number_segment x
-hls_start_number_vtt x
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